package com.qk.interceptor;

import com.qk.utils.CurrentUserHoler;
import com.qk.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

@Slf4j
@Component
public class TokenInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //获取请求路径
        String uri = request.getRequestURI();

        //判断是否是登录请求,如果是,放行
        if(uri.contains("/login")){
            log.info("登录请求:{},放行", uri);
            return true;
        }
        //获取请求头中的token
        String jwt = request.getHeader("token");
        //判断是否有token,如果没有,响应401状态码
        if(jwt ==null || jwt.isEmpty()){
            log.info("请求头中不存在token");
            response.setStatus(401);
            return false;
        }
        //解析token,如果解析失败,响应401状态码
        try {
            Claims claims = JwtUtils.parseToken(jwt);
            Integer userId = claims.get("id", Integer.class);
            log.info("当前用户id,存入ThreadLocal");
            CurrentUserHoler.setCurrentUser(userId);
        }catch (Exception e){
            log.info("令牌解析失败");
            response.setStatus(401);
            return false;
        }
        //放行
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        CurrentUserHoler.removeCurrentUser();
    }
}
